<refentry xmlns="http://docbook.org/ns/docbook"
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
          xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
          version="5.0" xml:id="man.charmap.use.subset">
<refmeta>
<refentrytitle>man.charmap.use.subset</refentrytitle>
<refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
</refmeta>
<refnamediv>
<refname>man.charmap.use.subset</refname>
<refpurpose>Use subset of character map instead of full map?</refpurpose>
</refnamediv>

<refsynopsisdiv>
<src:fragment xml:id="man.charmap.use.subset.frag">
<xsl:param name="man.charmap.use.subset" select="1"/>
</src:fragment>
</refsynopsisdiv>

<refsection><info><title>Description</title></info>

<para>If the value of the
<parameter>man.charmap.use.subset</parameter> parameter is non-zero,
a subset of the roff character map is used instead of the full roff
character map. The profile of the subset used is determined either
by the value of the
<parameter>man.charmap.subset.profile</parameter>
parameter (if the source is not in English) or the
<parameter>man.charmap.subset.profile.english</parameter>
parameter (if the source is in English).</para>

<note>
  <para>You may want to experiment with setting a non-zero value of
  <parameter>man.charmap.use.subset</parameter>, so that the full
  character map is used. Depending on which XSLT engine you run,
  setting a non-zero value for
  <parameter>man.charmap.use.subset</parameter> may significantly
  increase the time needed to process your documents. Or it may
  not. For example, if you set it и выполните команду it with xsltproc, it seems
  to dramatically increase processing time; on the other hand, if you
  set it и выполните команду it with Saxon, it does not seem to increase
  processing time nearly as much.</para>

  <para>If processing time is not a important concern and/or you can
  tolerate the increase in processing time imposed by using the full
  character map, set <parameter>man.charmap.use.subset</parameter> to
  zero.</para>
</note>

<refsection><info><title>Details</title></info>

<para>For converting certain Unicode symbols and special characters in
UTF-8 or UTF-16 encoded XML source to appropriate groff/roff
equivalents in man-page output, the DocBook XSL Stylesheets
distribution includes a <link xlink:href="http://docbook.sourceforge.net/snapshot/xsl/manpages/charmap.groff.xsl">roff character map</link> that is compliant with the <link xlink:href="http://www.w3.org/TR/xslt20/#character-maps">XSLT character
map</link> format as detailed in the XSLT 2.0 specification. The map
contains more than 800 character mappings and can be considered the
standard roff character map for the distribution.</para>

<note>
<para>You can use the <parameter>man.charmap.uri</parameter>
parameter to specify a URI for the location for an alternate roff
character map to use in place of the standard roff character map
provided in the distribution.</para>
</note>

<para>Because it is not terrifically efficient to use the standard
800-character character map in full -- and for most (or all) users,
never necessary to use it in full -- the DocBook XSL Stylesheets
support a mechanism for using, within any given character map, a
subset of character mappings instead of the full set. You can use the
<parameter>man.charmap.subset.profile</parameter> or
<parameter>man.charmap.subset.profile.english</parameter>
parameter to tune the profile of that subset to use.</para>

</refsection>
</refsection>
</refentry>
